Valve seat grinder



Dec. 31, 1935. E 2,026,051

VALVE SEAT GRI NDER Filed April 16, 1954 1/ 1/E \/7 0/e Ly/v55 52401/5.

Patented Dec. 31, 1935 VALVE SEAT GRINDER James A. Love, GlendalaCalif. Application April 16, 1934, Serial No.'720,759 l-Claim. (Cl. 51-185) My invention relates to a valve seat grinder and has for its principal object, the provision of a relatively simple, practical and inexpensive tool that may be conveniently employed for rapidly and efiiciently grindin valve seats and particularly seats for the valves of internal combustion engines.

Further objects of my invention are, to provide a valve seat grinder that includes a head having an inclined circumferential surface, upon which is removably mounted a section of abrasive material such as emery cloth and further, toprovide simple and eificient means for securing the abrasive member in position upon the head.

As a result of my improved construction, the section of abrasive material that is applied to the head, may be easily and quickly removed from the head when said material has become worn to such a degree as to render it unfit for service and the discarded section of the material replaced by a new section.

A further object of my invention is, to construct the head of the tool so that the section of abrasive material will be maintained in proper position upon the inclined surface of the head during valve seat grinding and surfacing operations.

With the foregoing and other objects in view my invention consists in certain novel features of construction and arrangements of parts that will be hereinafter more fully described and claimed and illustrated. in the accompanying drawing in which:

Fig. 1 is a side elevational view of a valve seat grinder constructed in accordance with my invention.

Fig. 2 is a vertical section taken on the line 22 of Fig. 1.

Fig. 3 is a plan view of the section of abrasive material that is applied to the head of the tool.

Fig. 4 is a sectional view similar to Fig. 2 and showing a modified form of the means utilized for clamping the abrasive material to the head.

Fig. 5 is a sectional view showing a further modified form of the means utilized for clamping the abrasive material to the head.

Referring by numerals to the accompanying drawing which illustrates a preferred embodiment of my invention, designates the body of the tool which is circular in form and the lower portion of said body is tapered toward its lower end so as to provide an inclined circumferentialsurface I I.

At the lower end of the inclined surface I l, the body is extended downward a short distance to form a flange I2 .and a narrowshoulder i3; is formed between the upper edge of flange 12 and the lower edge of the inclined surface .I I. 5

Formed axially through the body 'lil, is a tapered bore I 3, for the reception of the shaft or spindle 85 that carries and imparts rotary motion to the tool.

Formed in the body ID of the tool and extend- 1 ing at right angles across the inclined surface H, is a groove or channel It, that gradually tapers in width toward its lower end, which groove is for the accommodation of the ends of the sheet of abrasive material that is applied to 15 the head and for the means employed for clamping said ends in said groove. 1

The abrasive member that is applied to the head and which is shown in blank form in Fig. 3, consists of an arcuate section ll of emery cloth or the like. Obviously this abrasive member may be formed of any thin flexible material having one face coated with pulverized abrasive material such as emery or carborundum.

This abrasive member is positioned on the inclined face ll of the head with the lower edge of said member resting on the shoulder l3- and the ends of said member are extended into the sides of the groove IS.

The means employed for securing the ends of the abrasive member in the groove, comprises an inclined plate I 8, the side edges of which overlie the ends of the abrasive member that occupy groove l6 and secured to said plate, is a pin I9 that projects through an opening 20 formed through body l0 and the projecting end of this pin is threaded for the reception of a nut 2|, the latter bearing on top of head I0. Obviously when nut 2! is tightened, plate I8 is brought into gripping engagement with the ends of the abrasive e0 member, thereby holding the same securely against movement on the inclined face I I of the tool body. 1

In the modified form of the abrasive member clamping means illustrated in Fig. 4, a'screw 22 engages in a threaded socket 23 that projects upwardly from the clamping plate l8 and the head of the screw 22 is located in a recess 24 that is formed in the upper portion of body It).

In the modified construction illustrated in Fig. 5, a nut 25 that occupies a recess 26 in the body It, engages the threaded upper end of a pin 21 that projects upwardly from clamping plate l8. Nut 25 is provided in its upper portion with a transverse slot 28, for the reception of a suitable tool used in screwing the nut onto and ofi the pin 21.

In the construction illustrated in Figs. 4 and 5,

the means for clamping the plate It against the 5 ends of the abrasive member, are located wholly below the upper surface of the body of the tool.

Thus it will be seen that I have provided a valve seat grinding tool that is relatively simple in construction, inexpensive of manufacture and very effective in performing the functions for which it is intended.

The construction of the tool is such that the abrasive member when worn to such a degree as to render it unfit for service, may be easily and quickly removed and replaced by a new abrasive section and when the latter is properly applied to and clamped upon the body of the tool, it is firmly held in proper position for use.

In some instances it may be found desirable and advantageous to construct the grinder with two of the grooves l6 instead of a single groove as herein illustrated and described.

It will be understood that minor changes in the size, form and construction of the various parts of my improved valve seat grinder may be made and substituted for those herein shown and described without departing from the spirit of my invention, the scope of which is set forth in the appended claim.

I claim as my invention: 5

In a valve seat grinder, the combination with a substantially funnel-shaped body provided in the lower end of its inclined circumferential face with a shoulder and said body being provided with a groove that extends from said 10 shoulder upwardly to the upper end of the inclined face of said body which groove gradually decreases in width toward its lower end and. having inclined side faces, of a section of flexible abrasive material applied to the inclined face of 15 said body with its lower edge resting upon said circumferential shoulder, the ends of which section of abrasive material extend into the sides of the groove in said body, a tapered plate positioned in said groove and bearing on the ends 20 of the section of abrasive material that occupy said groove and means extending through the funnel-shaped body for clamping said plate against the ends of said abrasive member.

JAMES A. LOVE. 

